Anders Weberg hopes the near-feature-length promo will serve to whet audience appetites for his proposed 720-hour movie marathon, titled Ambiancé, which will be released in 2020. The director plans to release two further "trailers", one 7 hours and 20 minutes long and a second 72 hours long, in 2016 and 2018 before the final film debuts in its extended glory.

To break the world record, Ambiancé needs to surpass the length of current holder Modern Times Forever, which was "released" in 2011 and stretches over 240 hours. To watch Weberg's film from beginning to end without sleeping, viewers would need to sit tight in a cinema for 30 days.

The film-maker, who says Ambiancé will be his last movie, describes it as an "abstract nonlinear narrative summary of the artist's time spent with the moving image" that will show how "space and time is intertwined into a surreal dream-like journey beyond places".

Weberg has made more than 300 short films in a 20-year career. He plans to screen his latest work, which from the trailer looks set to take an abstract and experimental form, just once simultaneously on every continent from 31 December 2020. It will then be destroyed.

You can follow the project's progress at thelongestfilm.com. The trailer will be online until 20 July.